Code
C2511
Generic
C — Chassis
ABS Pressure Sensor Circuit — Intermittent Signal
Views:
UK: 17
EN: 18
RU: 13
AI status
Completed
Completed
100%
Causes
- Faulty/aging ABS hydraulic pressure sensor
- Loose, corroded or contaminated sensor connector
- Broken, chafed, pinched or intermittent wiring in the harness
- Poor power supply or ground to the sensor
- Intermittent internal fault in the ABS control module
- Water intrusion or debris in connector or sensor housing
Symptoms
- ABS warning lamp illuminated intermittently or continuously
- Traction/stability control warning or limited ABS function
- Occasional unexpected ABS activation or loss of ABS assistance
- Brake pedal pulsation or inconsistent brake feel during ABS events
- Fault code(s) stored and possibly intermittent drivability or warning history
What to check
- Read and record freeze frame and history from scan tool; verify C2511 present and whether intermittent flag set
- Visually inspect sensor connector and harness for corrosion, bent pins, broken insulation, or water ingress
- Wiggle-test wiring and connector while monitoring live sensor data to reproduce the intermittent behavior
- Check for proper power reference and ground at sensor connector with key on (refer to vehicle-specific manual)
- Backprobe and monitor sensor signal with a lab scope or multimeter while cycling the brake/ABS pump to watch for dropouts
- Inspect ABS hydraulic unit and sensor mounting for mechanical damage and contamination
Signal parameters
- Expected sensor output: analog voltage proportional to hydraulic pressure (typical range ~0.5–4.5 V depending on vehicle)
- Reference/power supply to sensor usually switched +5 V or vehicle battery voltage—verify with service data
- Low-frequency dropouts or abrupt voltage jumps indicate intermittent connection or internal sensor fault
- When healthy, signal should change smoothly with pressure and remain stable when pressure steady
- Open circuit shows infinite resistance; intermittent short to ground or battery will show abrupt voltage changes
Diagnostic algorithm
- Connect appropriate scan tool and verify stored C2511, freeze frame and live data for ABS pressure sensor
- Clear codes and attempt to reproduce fault while monitoring live sensor voltage and ABS pump activation
- Visually inspect sensor connector and harness; disconnect, inspect pins, clean with electrical contact cleaner, and reconnect securely
- Backprobe sensor power, ground, and signal terminals with key on and while operating brake/ABS pump; compare to expected voltages from service data
- Perform wiggle test along harness and at suspension/engine movement points while monitoring signal for interruptions
- Use an oscilloscope to observe waveform for dropouts or noise if available; use a multimeter for DC checks if scope not available
- If intermittent persists and wiring and connector are good, swap or bench-test sensor (if replacement sensor bench test available) or replace sensor and retest
- If new sensor and wiring checks do not clear intermittent, inspect/repair wiring to ABS module and verify module power/grounds; consider module fault if all else checks good
- After repairs, clear codes, perform road test with scan tool connected to confirm no recurrence and proper ABS operation
Likely causes
- Corroded or loose sensor connector at hydraulic unit
- Broken/chafed wire causing intermittent open/short when engine/between bumps
- Sensor internal intermittent failure due to heat or moisture
- Poor ground or low reference voltage from ABS module
- ABS hydraulic unit wiring damaged during service
Fault status
Status
Intermittent ABS pressure sensor circuit signal detected by ABS control module. Fault recorded; intermittent condition may cause ABS/traction warnings.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3 hours
Similar codes
Repair manuals
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Code
C2511
HYUNDAI
C — Chassis
TCS Off Indicator | Diagnostic Lamp Circuit Fail | Diagnostic(TPMS) Lamp Circuit Failure | MIL Hard Wired LED Short / Open Circuit
Views:
UK: 26
EN: 35
RU: 24
AI status
Completed
Completed
100%
Causes
- Faulty/aging ABS hydraulic pressure sensor
- Loose, corroded or contaminated sensor connector
- Broken, chafed, pinched or intermittent wiring in the harness
- Poor power supply or ground to the sensor
- Intermittent internal fault in the ABS control module
- Water intrusion or debris in connector or sensor housing
Symptoms
- ABS warning lamp illuminated intermittently or continuously
- Traction/stability control warning or limited ABS function
- Occasional unexpected ABS activation or loss of ABS assistance
- Brake pedal pulsation or inconsistent brake feel during ABS events
- Fault code(s) stored and possibly intermittent drivability or warning history
What to check
- Read and record freeze frame and history from scan tool; verify C2511 present and whether intermittent flag set
- Visually inspect sensor connector and harness for corrosion, bent pins, broken insulation, or water ingress
- Wiggle-test wiring and connector while monitoring live sensor data to reproduce the intermittent behavior
- Check for proper power reference and ground at sensor connector with key on (refer to vehicle-specific manual)
- Backprobe and monitor sensor signal with a lab scope or multimeter while cycling the brake/ABS pump to watch for dropouts
- Inspect ABS hydraulic unit and sensor mounting for mechanical damage and contamination
Signal parameters
- Expected sensor output: analog voltage proportional to hydraulic pressure (typical range ~0.5–4.5 V depending on vehicle)
- Reference/power supply to sensor usually switched +5 V or vehicle battery voltage—verify with service data
- Low-frequency dropouts or abrupt voltage jumps indicate intermittent connection or internal sensor fault
- When healthy, signal should change smoothly with pressure and remain stable when pressure steady
- Open circuit shows infinite resistance; intermittent short to ground or battery will show abrupt voltage changes
Diagnostic algorithm
- Connect appropriate scan tool and verify stored C2511, freeze frame and live data for ABS pressure sensor
- Clear codes and attempt to reproduce fault while monitoring live sensor voltage and ABS pump activation
- Visually inspect sensor connector and harness; disconnect, inspect pins, clean with electrical contact cleaner, and reconnect securely
- Backprobe sensor power, ground, and signal terminals with key on and while operating brake/ABS pump; compare to expected voltages from service data
- Perform wiggle test along harness and at suspension/engine movement points while monitoring signal for interruptions
- Use an oscilloscope to observe waveform for dropouts or noise if available; use a multimeter for DC checks if scope not available
- If intermittent persists and wiring and connector are good, swap or bench-test sensor (if replacement sensor bench test available) or replace sensor and retest
- If new sensor and wiring checks do not clear intermittent, inspect/repair wiring to ABS module and verify module power/grounds; consider module fault if all else checks good
- After repairs, clear codes, perform road test with scan tool connected to confirm no recurrence and proper ABS operation
Likely causes
- Corroded or loose sensor connector at hydraulic unit
- Broken/chafed wire causing intermittent open/short when engine/between bumps
- Sensor internal intermittent failure due to heat or moisture
- Poor ground or low reference voltage from ABS module
- ABS hydraulic unit wiring damaged during service
Fault status
Status
Intermittent ABS pressure sensor circuit signal detected by ABS control module. Fault recorded; intermittent condition may cause ABS/traction warnings.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
370
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